Agent may make mistakes and shouldn't be used in production
xAI's flagship model that excels at enterprise use cases like data extraction, coding, and text summarization. Possesses deep domain knowledge in finance, healthcare, law, and science. The fast model variant is served on faster infrastructure, offering response times that are significantly faster than the standard. The increased speed comes at a higher cost per output token.
import { streamText } from 'ai'
const result = streamText({ model: 'xai/grok-3-fast', prompt: 'Why is the sky blue?'})Try out Grok 3 Fast Beta by xAI. Usage is billed to your team at API rates. Free users get $5 of credits every 30 days, and you are considered a free user if you haven't made a payment.
| Model |
|---|
| 2M | 5.8s | 1097tps | $2.00/M | $6.00/M | Read: $0.2/M Write: — | — | — |  | 03/11/2026 | ||||
| 2M | 0.5s | 57tps | $2.00/M | $6.00/M | Read: $0.2/M Write: — | — | — | | 03/11/2026 | ||||
| 2M | 0.4s | 87tps | $2.00/M | $6.00/M | Read: $0.2/M Write: — | — | — | | 03/11/2026 | ||||
| 2M | 5.7s | 857tps | $2.00/M | $6.00/M | Read: $0.2/M Write: — | — | — | | 03/09/2026 | ||||
| 2M | 1.2s | 58tps | $2.00/M | $6.00/M | Read: $0.2/M Write: — | — | — | | 03/09/2026 | ||||
| 2M | 3.2s | 77tps | $2.00/M | $6.00/M | Read: $0.2/M Write: — | — | — | | 03/09/2026 | ||||
| — | — | | 01/28/2026 | ||||||||||
| — | — | | 01/28/2026 | ||||||||||
$0.00/img$0.01/sec | — | — | | 01/28/2026 | |||||||||
| 2M | 0.4s | 137tps | $0.20/M | $0.50/M | Read: $0.05/M Write: — | — | — | | 09/19/2025 | ||||
| 256K | 0.3s | 123tps | $0.20/M | $1.50/M | Read:$0.02/M Write:— | — | — | | 08/28/2025 | ||||
| 256K | 3.2s | 81tps | $3.00/M | $15.00/M | Read: $0.75/M Write: — | — | — | | 07/09/2025 | ||||
| 2M | 2.4s | 232tps | $0.20/M | $0.50/M | Read: $0.05/M Write: — | — | — | | 07/09/2025 | ||||
| 2M | 0.3s | 101tps | $0.20/M | $0.50/M | Read: $0.05/M Write: — | — | — | | 07/09/2025 | ||||
| 2M | 4.2s | 164tps | $0.20/M | $0.50/M | Read: $0.05/M Write: — | — | — | | 07/09/2025 | ||||
| 131K | 0.4s | 49tps | $3.00/M | $15.00/M | Read:$0.75/M Write:— | — | — | | 02/17/2025 | ||||
| 131K | 0.2s | 109tps | $0.30/M | $0.50/M | Read:$0.07/M Write:— | — | — | | 02/17/2025 | ||||
| 131K | 0.2s | 109tps | $0.60/M | $4.00/M | — | — | | 02/17/2025 |